Flipping an array of planes in random order using Animation Nodes
Instead of a Falloff you could use Compose Matrix. Math Nodes are there just to make a single plane rotate and you can feed it 100 random numbers to make them all rotate. Clamp node is there to restrict rotation.


One at a time
To make the planes rotate one at a time you need to replace the random numbers with a list of integers (One step is the time it takes for one rotation) and suffle them.